on the sensorless esc you just plug them in and see if its running either forward or backward when you hit the throttle and if it goes backward when you hit the throttle swap two of the wire around and that should do it but if its going forward at first then your good (sensorless esc's you don't have to worry about plugging them in the wrong way just because it does like what a brushed motor does it runs backwards if the wrong way)